What is the primary difference between propane and natural gas?

The primary difference between propane and natural gas lies in their composition. Propane is a hydrocarbon with a molecular formula of C3H8, which categorizes it as a compound made of three carbon atoms and eight hydrogen atoms. In contrast, natural gas is primarily composed of methane, which has the molecular formula CH4, consisting of one carbon atom and four hydrogen atoms. This fundamental difference in molecular structure affects various properties of the two fuels, such as their energy content, combustion characteristics, and how they are used in heating and cooking applications.

Understanding the composition aids in grasping why one fuel may be favored over the other in different contexts. For instance, propane has a higher energy content per unit volume compared to methane, making it a more efficient option for certain applications, especially in areas that lack natural gas infrastructure.

The other options touch on different attributes of propane and natural gas but do not capture the primary distinction that is based on their chemical makeup. While factors such as storage methods, cost, and combustion efficiency are important, they stem from the differences in composition and should be considered secondary to understanding their primary chemical differences.